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Transact SQL Tutorial: Pt. 5 - When to Use GROUP BY, DISTINCT, and An Overview of Aggregates in SQL

   Chapter: SELECT, INSERT, UPDATE and DELETE - Data Manipulation Language
Download! Skill Level: 100 (Beginner)
Duration: 8:02
Size: 6.64MB
Versions/Editions Covered: SQL Server 2005 , SQL Server 2008 , SQL Server 2000
Added/Updated: Mar 20, 2007

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This is video number 5 of a series of 7 masterfully recorded videos about working with the Data Manipulation Language (DML) SELECT statement. This video uses the Northwind database, focuses on a review of the GROUP BY statement and looks at the proper logic involved when implementing the GROUP BY statement. Scott Whigham has done a wonderful job when presenting us with the following informative related materials:
  • Introduction to the DISTINCT keyword
  • Definition and explanation of the DISTINCT keyword
  • Proper use of DISTINCT vs Improper use of GROUP BY
  • Functionality and requirements for GROUP BY
  • Gentle introduction to Aggregates
  • Basic introduction to the SUM() Function
This is a very informative video about the GROUP BY statement and is exactly what the doctor ordered if you would like to learn more about the GROUP BY statement. This video series is perfect for the novice, intermediate and advanced users alike.

NOTE: This video was written by one of our users, Wayne Leiser. Thanks, Wayne!
Tags for this video: aggregates clause distinct group by statement  
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This video is part of the following video series: "A Lengthy Overview of the SELECT Statement"
This lengthy 7-part series is all about working with the Data Manipulation Language (DML) SELECT statement.Covered in this video are also some simple main sequences of SQL focusing on the statements, requirements and their various uses.

Highlights:
  • Returns from a SELECT statement
  • Introduction to the SELECT, FROM, JOIN, WHERE, GROUP BY, HAVING, ORDER BY statements
  • Basic definition for result sets
  • Intro to the AND / OR clauses
  • Proper utilization of parenthesis () when writing queries
  • Proper use of DISTINCT vs Improper use of GROUP BY
  • When and why to use the HAVING clause
  • Simplistic and complex TOP clause examples

To view all videos in this series, click here

About the Instructor:
Scott Whigham Scott Whigham is the founder of LearnItFirst.com, one of the web's most extensive video training libraries focusing on technical training. Scott is also an experienced consultant, trainer, and author with more than a decade of hands-on experience working with SQL Server databases, writing and debugging applications using Visual Studio, and performance tuning. Scott designed the architecture (websites, class libraries, and database) for the LearnItFirst.com websites and, most re... (Scott Whigham's full bio can be found on the About the Author page)

   
 
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8/29/2008 1:38:32 AM